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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742695.0, MPI für Astronomie / Publikationen_mpia
Quenching versus quiescence: forming realistic massive ellipticals with a simple starvation model
Authors:Gutcke, T. A.; Macciò, A. V.; Dutton, A. A.; Stinson, G. S.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:4
Start Page:4614
End Page:4624
Audience:Not Specified
Abstract / Description:The decrease in star formation (SF) and the morphological change necessary to produce the z = 0 elliptical galaxy population are commonly ascribed to a sudden quenching event, which is able to rid the central galaxy of its cold gas reservoir in a short time. Following this event, the galaxy is able to prevent further SF and stay quiescent via a maintenance mode. We test whether such a quenching event is truly necessary using a simple model of quiescence. In this model, hot gas (all gas above a temperature threshold) in an ∼1012 M halo mass galaxy at redshift z ∼ 3 is prevented from cooling. The cool gas continues to form stars at a decreasing rate and the galaxy stellar mass, morphology, velocity dispersion and position on the colour-magnitude diagram (CMD) proceed to evolve. By z = 0, the halo mass has grown to 1013 M and the galaxy has attained characteristics typical of an observed z = 0 elliptical galaxy. Our model is run in the framework of a cosmological, smooth particle hydrodynamic code that includes SF, early stellar feedback, supernova feedback, metal cooling and metal diffusion. Additionally, we post-process our simulations with a radiative transfer code to create a mock CMD. In contrast to previous assumptions that a pure 'fade away' model evolves too slowly to account for the sparsity of galaxies in the 'green valley', we demonstrate crossing times of ≲1 Gyr. We conclude that no sudden quenching event is necessary to produce such rapid colour transitions.
Free Keywords:Hertzsprung-Russell and colour-magnitude diagrams; galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: formation; galaxies: stellar content; galaxies: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stx005
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